Plowshare



May 13, 1952 w GIEDD 2,596,769

PLOWSHARE Filed May 6, 1946 INVENTOR:

Enuel Wiied'd,

Patented May 13, 19 52 PLOWSHARE Emanuel W. Giedd, Sioux Falls, S. Dak.

Application May 6, 1946, Serial No. 667,648

1 Claim. 1

This invention relates to plow shares or cultivator blades and the like and has for one of its objects to improve generally upon such articles so as to make them more practical, eflicient and advantageous in use, as well as to prolong the working life and usefulness of such devices.

An especial object is to lighten and minimize the weight of the structure and at the same time provide ample stiffening and strengthening reinforcement to the same, with special structural provision enabling the device to be self-sharpenmg in use.

Other objects and advantages to be attained will hereinafter be more fully set forth in the following description.

A practical but non-limiting exemplification of the invention is set forth in the accompanying drawings, in which Figure 1 is a bottom plan view of a plow share illustrative of a practical adaptation of the invention;

Figure 2 is a longitudinal section of the nose portion of the plow share, taken on the line 2--2 of Figure 1;

Figure 3 is a cross section of the share portion of the device, taken on the line 3-3 of Figure 1;

Figure 4 is a fragmentary detail sectional view taken on or about the line 4-4 of Figure 1 and illustrative of a practical cross-sectional form of a reinforcing rib; and

Figure 5 is a section in the line 5-5 of Figure 1.

Referring now to the drawings in detail, the numeral 5 designates, generally, a detachable and replaceable plow share or cultivator blade or tooth, as a whole. As shown, the article 5 comprises a landside portion 6 and a rearwardly extending side cutter and slicer portion 1. The landside portion 6 is generally vertically disposed and positioned in the normal or regular use of the device, and the portion 1 is inclined outwardly and rearwardly from the landside portion.

The landside portion 6 of the device, as shown, includes the side plate portion '8 and the integral laterally offset flange 9, of substantially triangular form in side elevation and whose rear portion is of substantial thickness, as at Ill, and the forward portion thereof is reduced considerably in thickness, as at I I.

As shown, the portion I I of the flange 9 is tapered from the adjoining side wall or plate portion 8 to its outer edge, which latter is thinned down to quite a sharp edge (see Figure 5). This relatively thin flange portion II merges at its inner longitudinal end portion with the substantially thicker rearward portion II) of the flange in 2 a transverse shoulder I2 which, preferably, is not an abrupt one but, rather, is slantingly beveled or rounded out, as a fillet (see Figure 1).

The rearward and under portion I3 of the rearwardly inclined part I of the device is of substantial thickness (see Figure 3) and so is the forward and rearward upstanding portion I4 of the plate part 8. So, too, the rearwardly. in-' clined plate portion I of the device is preferably of a curved, slightly concavo-convex cross section with the bow at the side face of the device corresponding to that from which the angular flange 9 is projected (see Figures 2 and 3). However, the present invention is not limited strictly to the precise cross-sectional form shown but such form is susceptible of considerable modification and change within the purview of the invention as hereinafter claimed.

As far as the present invention is concerned, any suitable or approved means may be provided on the plow share for its original attachment, removable and replacement on a conventional plow or cultivator. As shown, it is provided with the usual button type, relatively large, lug 21, located near the rear end portion thereof, with a smaller lug 28 located slightly forwardly thereof on the inclined body portion thereof. The relatively thick portion II] of the flange 9 of the share, as shown, is provided with an elongated, rib 29 which serves as a part of the attaching provision of the share.

The prime and more essential feature of the invention is the relative structural form and arrangement of the share so as to give desired light ness with needed strength and durability thereto and self-sharpening effect to the digging and cutting thereof, as will now be described.

As hereinbefore described, the flange 9, which is substantially triangular in plan form, has its rear portion I0 comparatively thick. However, its forward portion I I is reduced considerably in thickness and it is also preferably tapered slightly to a rather sharp lateral edge. This portion II of reduced thickness, as before described, terminates at its rear longitudinal end in a nonabrupt shoulder I2 where it thus merges with the aforesaid thicker portion I0. The flange 9 is also preferably formed integrally with the adjacent portion 8 of the share.

As previously stated, the forward portion I4 of the plate portion 8 of the share is of substantial thickness like the rear portion I3 of the inclined part I. In fact, the portions I3 and I4 are of one and the same thickness throughout the extent thereof. However, the forward portion I5 of the part 8 and the side edge portion l6 of the inclined upper part 1 are reduced considerably in thickness, these portions I5 and I6 having a common continuous cutting edge, the rearwardly extending edge portion I! of which is somewhat elongated and inclinedly set, while the forward portion l8 of said cutting edge is curved forwardly and downwardly to a relatively short, inclined vertical cutting edge 58. These two continuing edge portions 15 and it and the forward end edge portion H! are preferably beveled to produce a substantially fine cutting edge proper instead of being cut squarely crosswise so as to produce a decidedly blunt cutting edge as would occur if not beveled as just above described. This is here stressed because, according to the invention, the portions of reduced plate-like thickness 1.5 and 16 are especially formed in one and the same thickness throughout. This is to produce the selfsharpening feature of the invention and at the same time maintain a constantly uniform thickness of said reduced portions 15 and I6 as the cutting edge portions [7, i8 and i9 wear away due to their continuous working contact with the ground which is being plowed or cultivated, and also when the cutting edges are sharpened by physical sharpening means in some cases.

The portion of reduced thickness I6 of the share terminatessome distance inwardly from the elongated and inclined cutting edge portion H at an elongated shoulder 29 extending longitudinally of the inclined portion l3 of the share and preferably parallel with said cutting edge portion 17. This shoulder, like the aforesaid base shoulder I2, is preferably non-abrupt.

Extending in parallel relation to each other, and at right angles to the shoulder 20, is a multiplicity of ribs 2| formed on the reduced thickness portion I6 of the share. These ribs 2| are preferably tapered in cross section (see Figure 4) That is to say, they are wider at their bottom portions which merge flaringly and roundedly with the adjacent face portions of the portion 16 of the share. The ribs thus effectively reinforce and stiffen the relatively thin plate-like part of the share. So, too, the several ribs 21 terminate at their outer ends some distance short of the cutting edge 11 so as not to interfere with the cutting action of said edge I? in use of the share.

Also, the outer ends of said ribs 2| are preferably beveled off, as at 22 (see Figures 1 and 3).

The outer ends 22 of the ribs 21 are made to terminate normally a substantial distance short of the cutting edge I! not only so as not to interfere with the cutting action of said edge I! but to also permit considerable wearing away of the edge in use without appreciable interference by the ends of the ribs.

It is here noted that, after the edge portion IT has worn away an appreciable amount in use, the beveled end portions 22 may be ground off by suitable physical means so as to shorten the ribs and again provide a substantial space between the ends of the ribsand said cutting .edge [1, this provision prolonging'the usefulflworking life Of the plow share. a

In the forward region of the share, the thicker plate portion I4 is considerably wider than the thickened portion I 3 and the portion l5 of reduced thickness is much narrower than the These ribs 24 have the same'reinforcing effect as the aforesaid ribs 2| and the end portions 25, which are similar to and positioned in substantially the same relation as the corresponding ends 22 of said ribs 2| are readily ground off when it becomes necessary as in the case of said ribs 2 I.

The forward shoulder 23 joins and merges with a rearwardly extending reinforcing rib 26 which is of somewhat triangular plan form and thus provided to reinforce the extreme nose part of the digger edge IQ of the share so that said ed e 19 may wear cons d rab y away yet stiu be cuttingly eff ct ve With t any i te ference by the rib 26, t e forward end portidn f which latter like the corr spo di g end of the aieresaid ribs 21 n 2 :i readily ground away by applied physical m ans to res or amp e earance space between said rib end and the d g er e ge 19- While th illustrated, construction and arrange ment is a p actical mplification f the invention the same is not thereby limited to the preciseform shown but admits of considerable gnodiq fi atio a d h n Wi n the spirit and sc pe f the appended claim.

What is claimed is: i

A p w s are w p s d f a b dy portion and a sh p s d b dy p tion h ving .a cut in portion of equal but reduced thickness throughout provided with a self-sharpening cut ing ed and a series of spaced reinforcing ribs extending at substantially right angles to the cutting edge u t min in short thereoiand at their inner ends abutting the shoulderresultant .f-rfim the reduced cutting portion, the sides of the ribs being flared outwardly and the terminal edges of the ends being bevelled, the cutting portion adjacent the shoe portion being of reduced width, ribs on said reduced portion of less length than first mentioned ribs and'a reinforcing rib ar-z ranged substantially parallel to the base of the shoe which extends outwardly from the lower end of the shoulder formed at the reduced cutting portion of the plow share,

EMANUEL W. GIEDD.

The following references are of record in the file of this patent:

UNITED STATES PATENTS 

